metamorphic

Green serpentine or nephrite-like stone

Serpentinite, chiefly serpentine-group minerals; exact identification would require testing

AI-generated identification · may be incorrect

Typically green to mottled dark green, waxy to greasy luster, fine-grained and massive; Mohs hardness about 2.5–4, with no obvious cleavage. The specimen appears opaque and naturally rough, possibly containing darker magnetite or chromite grains.

Identified August 20, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks, especially peridotite, undergo hydration and metamorphic alteration; commonly associated with ancient ophiolites and subduction zones, generally ranging from Precambrian to Recent geological settings.

Uses & applications

Low-grade material is used for carvings, ornaments, and decorative stone; tougher nephrite jade is used for jewelry and tools, while serpentinite has limited architectural use because of weathering and asbestos-related concerns.

Geological facts

Serpentine is a mineral group rather than one single mineral, including lizardite, antigorite, and chrysotile. Visual similarity to jade is common, but jade requires greater toughness and laboratory or gemological testing.

Field identification & locations

Common in California, New Zealand, Italy, Canada, Russia, and ophiolite belts worldwide; identify by its waxy green appearance, low hardness, and often soapy feel. Do not cut or abrade unknown serpentinite, as some varieties may contain fibrous chrysotile asbestos.